Compilare: user.cpp: In function ‘int dimensiune()’: user.cpp:42:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < l) ^ user.cpp:67:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i*i < n) ^ user.cpp: In function ‘void matrice(int, int, int, int)’: user.cpp:75:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i1 <= i2 && j1 <= j2) ^ user.cpp:74:15: warning: unused variable ‘nr’ [-Wunused-variable] int x, y, nr; ^